Nu-22B (R-422B): Drop-In R22 replacement
I came across this today NU-22B Literature, and it looks promising for R22 replacement.
Composed of:
- 55% HFC-125
- 42% HFC-134a
- 3% Isobutane (HC-600a)
The literature goes on to further state that this drop-in R22 substitute is fully compatible with Mineral, AB, and POE oils, and that it is nonflammable to boot. So basically no oil substitution is required.
This ability to work with any oil, is made possible by the Isobutane part of the blend. I found it most interesting that such a small percentage of this component could make it work even with mineral oil. Of course keeping the percentage of Isobutane low, makes the overall blend nonflammable as well.
Could be a nice way to go in the first stage of a cascade, or even as part of the mixture for an autocascade. Of course it would also work well in a single stage unit.
Substitutes for R22 in Polycold PFC systems
I designed the S-10 technology (AKA Telemark TVP) system. The extensive work we have done in Stratox with various substitutes shows that there is no viable drop in solution for the PFC.
However we have had a great deal of success with non-infringing HCFC blends providing the compressor oil is changed to a Polyol Ester (POE) oil. The protocol is well established in other areas and Carlyle publish a guide to the oil types to be used.
When changing the gas or refilling I would recommend strongly fitting a dual Temprite 905 coalescent oil separator before the condenser as well as the usual filter drier.
This will improve efficiency and also lengthen the life of the PFC, as any one who has worked on these systems they are not that reliable and very prone to oil migration.
Incidentally S-10 / Telemark system has multiple coalescent filters fitted in the array and it doesn't have this particular issue. There are others but that's for them to work out.
Quote:
Originally Posted by
mytekcontrols
I came across this today
NU-22B Literature, and it looks promising for R22 replacement.
Composed of:
- 55% HFC-125
- 42% HFC-134a
- 3% Isobutane (HC-600a)
The literature goes on to further state that this drop-in R22 substitute is fully compatible with Mineral, AB, and POE oils, and that it is nonflammable to boot. So basically no oil substitution is required.
This ability to work with any oil, is made possible by the Isobutane part of the blend. I found it most interesting that such a small percentage of this component could make it work even with mineral oil. Of course keeping the percentage of Isobutane low, makes the overall blend nonflammable as well.
Could be a nice way to go in the first stage of a cascade, or even as part of the mixture for an autocascade. Of course it would also work well in a single stage unit.